三、阅读理解。
阅读下面的短文,从短文后所给的五个选项中选出能填入短文空白处的最佳选项,使短文通顺、连贯,意思完整。
Do you know what the Body Mass Index (BMI,体重指数) is? BMI is a way that uses your height and weight to work out if you are healthy. For healthy adults, the normal BMI is between 18.5 and 23.9. 1 Otherwise, you are too thin.
Some cities in China have included BMI in the P.E. test for the senior high school entrance examination. For example, Beijing announced (宣布) that BMI became a subject of the P.E. test. 2
Zhang Yanshu is a middle school student from Beijing. He used to be too fat. He decided to lose weight by exercising. "It was this summer that I decided to work on my BMI," Zhang said. 3 Then he took his training course. "I think BMI and the events for the training go well together. When I practice the events, my BMI gets better. After my BMI gets better, I feel that I have more energy to train."
4 "I ate brown rice instead of white rice, and chicken for meat most of the time," he said. "It wasn't easy at first." His BMI reached a normal level (水平) after four months of exercise.
Chen Kaifei, 14, is too thin. She is not fat, but she still has a problem of "figure anxiety (身材焦虑)". 5 Chen said, "Everyone has a better understanding of their body and health condition, and I started to care about my diet and lifestyle every day, simply to keep my BMI at a good level."

1.
2.
3.
4.
5.

1.A
2.D
3.B
4.C
5.E

四、阅读理解。
阅读下面的短文，根据短文内容，从题中所给的 A、B、C、D 四个选项中，选出最佳答案。
Like cool swims and lazy vacations, fireflies are a sign of summer. Some of us have sweet memories of catching them on hot summer evenings. But how much do you really know about these little creatures?
Fireflies use their lights to “talk”—mainly to find mates, but also to protect their homes and drive away things that might hurt them. What’s special is that their light doesn’t make any heat. This “cold light” comes from two chemicals（化学物质）in their body—luciferin and luciferase. When mixed with ATP（found in all living things）and $\ce{O_{2}}$, they create the light. Fireflies truly are nature’s tiny lanterns. Sadly, human activities are putting them in danger.
One big problem is the loss of homes. As cities and farms develop, the forests and fields where fireflies live are being destroyed. Another problem is light pollution. The light from homes, cars and streetlights makes it harder for fireflies to signal（发信号）to each other during mating. This means fewer baby fireflies will be born next season.
Here are some easy ways to help. First, turn off outdoor lights so that fireflies can signal each other freely. Also, leaving fallen trees, dead leaves, and natural waste in yards gives a good place for baby fireflies to grow. Since most fireflies live near still water, creating small ponds can bring them in. Most importantly, stop using too many pesticides（杀虫剂）which are bad for fireflies too.
Making these simple changes isn’t just about helping fireflies—it’s about keeping the magic of summer alive. Let’s work together to protect the beautiful glow for kids in the future.
1.Fireflies mainly use their lights for .
（）
A.creating sweet memories
B.staying cool on hot nights
C.communicating with mates
D.finding different chemicals
2.Which of the following are needed to create fireflies’ “cold light”?
（）
①Heat ②Two chemicals ③ATP ④$\ce{O_{2}}$
A.①②③
B.②③④
C.①②④
D.①③④
3.What is the main reason that puts fireflies in danger?
（）
A.Summer heat.
B.Cold season.
C.City growth.
D.Natural waste.
4.To help fireflies, we can .
（）
A.turn on more streetlights
B.tidy yards every day
C.save water for farming
D.use fewer pesticides
5.What is the writing purpose of the text?
（）
A.To show ways to catch fireflies.
B.To list the problems of fireflies.
C.To compare all kinds of fireflies.
D.To call on protection for fireflies.

1.C
2.B
3.C
4.D
5.D